We'll brg in former fbi special agent and abc news consultant brad garrett to what happens to them next in the investigation. He joins us interest from washington. You're known for profiling men like the castro brothers. There's no idea of what -- we're just learning what possibly could have been happening in the house but people want to know how do these -- how is it possible? How can you keep people there for so long, brad? Well, I guess the real question, robin, is have they been in that same house for ten years or did he move them there? The biggest problem when you abduct people is how do you hold them this length of time without them getting away? And the only answer I can give you is there had to be some compliance on the girls' part at some point. That doesn't mean they want to be there or they desire to be there, but ty just sort of went along with the program, you know, weeks turned to months and months turned to years. Still unclear about what his motive might have been as far as why did he abduct these three women. And how will the investigation proceed now with the castro brothers, brad? Well, the real key is are there other victims out there? That's the first answer -- the victim interviews and the bad guy interviews are going to be who else is out there? Where should we be looking? And how do they -- the authorities talk with the young women? It's such a delicate matter right now and, of course, they have invaluable information, so how do they go about talking to them. You have to really focus in on their needs and feelings. After you sort of get over that hump then 5 you approach them about tell us what happened. Bottom line, they survived. They de what they needed to do to survive. All right, brad, thank you very much.

This transcript has been automatically generated and may not be 100% accurate.

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